Still not convinced about the extra strength of seats required
The secret seating business is in the data plate glyphs hidden somewhere on the seat.
(a) if a seat is certificated (and the data plate so reflects) for forward facing only, then it may not be installed, as is, aft facing. No reason why you can't modify and re-certify the seat to be an aft facer but that generally requires some structural modification to carry the loads, as well as a head rest extension to meet a certification design requirement for back/head support.
(b) if a seat is certificated for both forward and aft, then it can be configured either way, generally with only a requirement to have a tall headrest fitted for installation as an aft facer (unless the basic seat back is tall enough for a tick in the box).
I can't speak to your specific seat examples but the above is the way it is, I'm afraid. Typically F/A seats are incorporated into the aircraft structure so they are a bit different to freestanding pax seats.
Specifically, what bits are you unconvinced about and maybe we can address them rather than going around in circles ?